CVE-2019-16789
Published: 26 December 2019
In Waitress through version 1.4.0, if a proxy server is used in front of waitress, an invalid request may be sent by an attacker that bypasses the front-end and is parsed differently by waitress leading to a potential for HTTP request smuggling. Specially crafted requests containing special whitespace characters in the Transfer-Encoding header would get parsed by Waitress as being a chunked request, but a front-end server would use the Content-Length instead as the Transfer-Encoding header is considered invalid due to containing invalid characters. If a front-end server does HTTP pipelining to a backend Waitress server this could lead to HTTP request splitting which may lead to potential cache poisoning or unexpected information disclosure. This issue is fixed in Waitress 1.4.1 through more strict HTTP field validation.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
waitress Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| disco |
Ignored
(end of life)
|
|
| eoan |
Ignored
(end of life)
|
|
| focal |
Not vulnerable
(1.4.1-1)
|
|
| groovy |
Not vulnerable
(1.4.1-1)
|
|
| hirsute |
Not vulnerable
(1.4.1-1)
|
|
| impish |
Not vulnerable
(1.4.1-1)
|
|
| jammy |
Not vulnerable
(1.4.1-1)
|
|
| kinetic |
Not vulnerable
(1.4.1-1)
|
|
| lunar |
Not vulnerable
(1.4.1-1)
|
|
| mantic |
Not vulnerable
(1.4.1-1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(1.4.1-1)
|
|
| xenial |
Needed
|
|
|
Patches: upstream: https://github.com/Pylons/waitress/commit/11d9e138125ad46e951027184b13242a3c1de017 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.2 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N |